Sell again at the end (6)
I believe the answer is:
retail
'sell' is the definition.
(retailing is a kind of selling)
'again at the end' is the wordplay.
'again' becomes 're'.
'at' is a charade indicator (letters next to each other).
'the end' becomes 'tail' (tail is a kind of end).
're'+'tail'='RETAIL'
(Other definitions for retail that I've seen before include "Sell; pass on (e.g. gossip)" , "This trade sells to the general public" , "report" , "Trade selling goods to the general public" , "Tell story" .)